Verhalten von Kohlenstoffstählen unter Gleitkorrosion

Translated title of the contribution: Behaviour of low-alloyed C – Steels under Sliding / Corrosion

Andreas Trausmuth

Research output: ThesisDiploma Thesis

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Abstract

For the oilfield application for “crude oil and natural gas” corrosion phenomena play an important role and are limiting the lifetime of tribological systems. In a lot of different studies that synergistic effects between mechanical sliding and corrosion often lead to increased volume losses when compared to their individual contributions. Low-alloyed C-steel was used as base material and was tribologically loaded in a novel close-to-reality test rig under reciprocating sliding contact against spray Ni - based coating counterpart. Within this work the tribological performance of low-alloyed C-steel under sliding / corrosion conditions at specific oxygen-free environment using CO2 - atmosphere and brine were analysed and characterised. Additionally, pure sliding tests were carried out under N2 - atmosphere with distilled water and also pure corrosion tests with CO2 - atmosphere with brine for comparison. FEM - simulation shows the contact pressure and stresses, which have and influence on sliding / corrosion contact and damage mechanisms. For the understanding concerning sliding-corrosion phenomena different microscopic methods were applied (e.g., optical light microscope, SEM (scanning electron microscope) -FIB (Focused Ion Beam)). The results show a significant influence of the microstructure on the tribological performance under sliding-corrosion conditions; where the formation of corrosion siderite layers (FeCO3) plays a crucial role for the tribological performance.
Translated title of the contributionBehaviour of low-alloyed C – Steels under Sliding / Corrosion
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Mori, Gregor Karl, Supervisor (internal)
  • Pauschitz, Andreas, Supervisor (external), External person
Award date20 Oct 2017
Publication statusPublished - 2017

Bibliographical note

embargoed until 22-11-2021

Keywords

  • Tribology
  • corrosion
  • sliding corrosion
  • electrochemistry
  • surface passivation
  • lattice micro structure

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